Configuring storage systems to migrate data
To avoid performance issues, you must ensure that your SAN-attached storage systems and switches are correctly configured to work efficiently with Storwize® V3500.
The management GUI can be used to detect and configure internally attached storage to be used for virtualization. For external storage, you can migrate data only to internal storage. The system supports storage system migration through SAS and iSCSI connections, but requires an appropriate optional host interface adapter to communicate with storage systems that are attached with Fibre Channel connections. The system does not require a license for its own control and expansion enclosures. However, a license is required for each enclosure of any external storage systems that are being virtualized. For example, if the system is made up of one control enclosure, one expansion enclosure, and one virtualized storage system that is itself made up of two enclosures, two licenses are required.
Virtualization provides many benefits over direct-attached or direct SAN-attached storage systems. However, virtualization is more susceptible to performance hot spots than direct-attached storage. Hot spots can cause I/O errors on your hosts and can potentially cause a loss of access to data.